EP2235855A1 - Mécanisme de rapport dans un système radio réutilisant un créneau temporel - Google Patents

Mécanisme de rapport dans un système radio réutilisant un créneau temporel

Info

Publication number
EP2235855A1
EP2235855A1 EP08871897A EP08871897A EP2235855A1 EP 2235855 A1 EP2235855 A1 EP 2235855A1 EP 08871897 A EP08871897 A EP 08871897A EP 08871897 A EP08871897 A EP 08871897A EP 2235855 A1 EP2235855 A1 EP 2235855A1
Authority
EP
European Patent Office
Prior art keywords
report
node
mobile station
radio system
signal strength
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP08871897A
Other languages
German (de)
English (en)
Other versions
EP2235855B1 (fr
Inventor
Benny Lennartson
Tomas Andersson
Miguel Lopez
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from PCT/SE2008/050116 external-priority patent/WO2009096832A1/fr
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of EP2235855A1 publication Critical patent/EP2235855A1/fr
Application granted granted Critical
Publication of EP2235855B1 publication Critical patent/EP2235855B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength

Definitions

  • the present invention relates to a method and a device for processing signals transmitted in a cellular radio system.
  • GSM Global System for Mobile communication
  • the Global System for Mobile communication is a single carrier system in which a speech user is assigned to one timeslot.
  • the information bits on this timeslot contain information intended only to this user. If half-rate is used, then every second burst is used by one user and every other burst is used by another user. Moreover, in the half-rate channel the information bits on one burst are connected to only one user.
  • MUROS Multi-User Reusing One Slot
  • a compensation unit is provided to convert information about downlink signal strength in a measurement report received from a mobile station when the signal to the mobile station is transmitted using several co-channel signals transmitted simultaneously in the same time slot and at the same frequency.
  • the transmitter is adapted to feed the compensation unit with the relative powers of the co-channels.
  • the signal is transmitted as an ⁇ -QPSK modulated signal and in particular as an adaptive ⁇ -QPSK modulation signal.
  • a converted report is sent from a BTS to the Base Station Controller (BSC).
  • BSC Base Station Controller
  • a report is converted based on the ⁇ used in the corresponding downlink transmission.
  • PCT/SE2008/050116 incorporated herein by reference it is proposed to use a hybrid quaternary modulation in the DL (Downlink).
  • the signal constellation is parameterized by a real valued parameter called a .
  • the multiplexing and modulation scheme is called a -QPSK.
  • the two user signals are mapped to the real and imaginary parts of the baseband signal. These are called the I and Q sub-channels, and under some conditions they are orthogonal.
  • the proposal PCT/SE2008/0501 16 allows compatibility between MUROS capable networks and legacy Mobile stations (MS).
  • the measured signal strength on the downlink will as is realized by the inventor be the sum of the signal power received on both sub channels. This is due to the fact that a legacy mobile is not aware of the existence of two subchannels. This means that the signal strength reported to the Base Station Controller (BSC), in a layer 3 (L3) message MEASUREMENT REPORT, will not be correct. Even Single Antenna Interference Cancellation (SAIC)-type of mobile stations designed specifically to decode one orthogonal sub-channel may be able to report only the total signal strength.
  • BSC Base Station Controller
  • L3 layer 3
  • SAIC Single Antenna Interference Cancellation
  • - Fig. 1 is a view of an adapted ⁇ -QPSK modulator
  • - Fig. 2 is a view of a radio system
  • Fig. 3 is a flowchart illustrating steps when generating a measurement report in a node of a radio system.
  • a modulator 400 configured to divide the total energy of a QPSK modulated signal unequally between the two branches of the modulated signal is depicted.
  • the exemplary modulator 400 can be used in transmission of data using an adaptive ⁇ - QPSK modulation.
  • the modulator 400 comprises initial modulators 401 and 403 for receiving and modulating to binary symbols the data sequences to be transmitted to two different mobile stations.
  • the modulators 401 and 403 are coupled to a mapping unit 405 adapted to map the signals from the modulators 401 and 403 in accordance with an adaptive a -QPSK constellation.
  • the adaptive a -QPSK constellation sequence formed in the unit 405 is forwarded to a rotation block 407 connected to a pulse shaping filter 409 which in turn is connected to a unit 41 1 adapted to mix-up and amplify the multiplexed data sequence to be transmitted to the intended receivers to the carrier frequency.
  • the modulator 400 may receive feedback from one or both mobile stations to which data is transmitted. In response to received feedback the modulator can be adapted to adjust a accordingly.
  • a may be set to depend upon the distances from the two mobile stations to the Base Transceiver Station (BTS), the reported received signal quality (RXQUAL), or upon the capabilities of the mobile stations, e.g. legacy/aware of the existence of the co-existing channels.
  • BTS Base Transceiver Station
  • RXQUAL reported received signal quality
  • a mobile station either legacy or possibly aware of the sub-channel structure, using one of the sub-channels in an a -QPSK modulated signal, as described in PCT/SE2008/0501 16 will report a signal strength in a measurement report that contains an estimate of the total power in both sub-channels sharing the same timeslot.
  • the measurement report is modified in a node of radio system before being forwarded in the system.
  • an exemplary radio system 200 such as a GSM system, transmitting a signal on sub-channels, such as an a -QPSK modulated signal, is depicted.
  • the system described below is a GSM system but the invention is not limited to a GSM system and can be applied to other types of multiplexing and modulation schemes, where several co-channel signal are transmitted simultaneously but the receivers can only estimate the total receiver power.
  • the transmission is performed using an a -QPSK modulated signal.
  • the system 200 further comprises a Base Station Controller (BSC) 203.
  • the BTS 201 comprises a BTS receiver for receiving radio signals from mobile stations MSl and MS2.
  • the BTS 201 further comprises a compensation unit 207 for compensating reported received signals strengths from mobile stations MSl and MS2.
  • the BTS 201 further comprises a Control unit 209 adapted to select a value for ⁇ to be used for transmitting an a -QPSK modulated signal.
  • the value selected by the Control Unit 209 is fed to the compensation unit 207 and to a modulator 400 adapted to modulate signals to be transmitted to the mobile stations MSl and MS2.
  • the BSC 203 comprises control loops 211a and 211 b for controlling transmit power to the respective Mobile stations MSl and MS2.
  • the power control loops 211a and 21 Ib in the BSC 203 will calculate two separate power levels for each sub channel used for transmitting signals to the mobile stations MSl and MS2. This power level can be calculated using a conventional power control loop. As a result the power control loops 21 1a and 211b assume that the power is the power that will be used on the downlink from the BTS 201. The two power levels determined by the loops 21 1a and 21 Ib, denoted Pl and P2 in figure 2, can be sent over the Abis interface to the BTS 201.
  • control unit 209 can be adapted to decide what a to use on the a -QPSK modulated signal so that the power for the transmitted data is set in response to the relative gain of the two branches.
  • ⁇ is set such that the power experienced by each of the mobile stations is equal to what they would require if they were alone on the timeslot.
  • a legacy mobile will measure the signal strength as described in 3GPP 45.008 specification, it follows that it will measure the total power used for both sub channels. Even a mobile aware of the sub-channels may report the signal strength in the same way. The mobiles will report the signals strengths, SSl_measured and SS2_measured, in a measurement report to the BTS 201.
  • the reported signal strengths are compensated depending on the a used in the previous transmission period.
  • the compensated signal strengths called SSl_comp and SS2__comp in figure 2, are then transmitted in the measurement result to the BSC 203 where it is fed into the power control loop.
  • all BSC functionality using the downlink signal strength as input can be set to use the compensated reported signal strength as input signal.
  • the unit 207 can be placed in the BSC node 203.
  • the compensation is performed in the BSC node 203 or any other node where the unit deciding the ⁇ to be used is not located the value of the a used must be forwarded from the BTS 201 to the BSC 203 or from the node where the ⁇ is determined to the node where the compensated signal strength report is generated.
  • the unit 207 In case the unit 207 is located in the BSC 203, the a value used during different transmission periods also needs to be sent over Abis to the BSC.
  • a flow chart illustrating procedural steps when generating a measurement report is depicted.
  • the procedure in Fig. 3 can for example be performed in the Unit 207 of Fig. 2.
  • a measurement report is received from a mobile station.
  • the measurement report is modified based on the individual signal strength of the subchannel used in the transmission for the mobile station when several co-channel signals are transmitted simultaneously.
  • the individual mobile station measures the total signal strength and all power is not used for the sub-channel of the mobile station the report, if not modified can be misleading. This modification will typically only change the value in the measurement result by a few dB. If the report is modified in the BTS, no additional changes are needed in the BSC node.
  • the modified report is forwarded to an intended receiver in a step 305.
  • the BTS can forward the modified report to an associated BSC and the BSC can use the modified report in its power control.
  • the legacy mobile measures the signal strength on the downlink to -65 dBm.
  • sub-channels are provided by the use of adaptive ⁇ QPSK modulation.
  • the a compensation for this specific sub channel was -2 dB, i.e. the signal on this sub channel was 2dB weaker than the total signal power), compared to the total transmitted power for both channels.
  • step 303 the BTS will compensate this measurement with -2 dB from -65 dBm to -67 dBm, for this sub channel. This means that the signal strength reported to the BSC 203, in the measurement result, will be -67dBm.
  • the invention is as set out above applicable to all types of multiplexing and modulation schemes where several co-channel signal are transmitted simultaneously but the receivers do not or cannot estimate the signal strength of their own sub-channel, but can only estimate the total receiver power.
  • An important field of application is when transmission is based on the use of adaptive ⁇ QPSK modulation.
  • the transmitter is adapted to feed the compensation unit with the relative powers of the sub-channels.
  • BSC functionality such as for example Power Control, Locating functionality controlling things such as inter- and intra-cell handovers, without any modification even when two users are multiplexed in the downlink using for example ⁇ -QPSK -modulation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Selon l'invention, dans un nœud de système radio, tel qu'une station d'émetteur-récepteur de base (BTS), une unité de compensation est mise en oeuvre pour convertir des informations concernant une intensité de signal de liaison descendante dans un rapport de mesure reçu d'une station mobile lorsque le signal vers la station mobile est transmis à l'aide de plusieurs signaux sur canal commun transmis simultanément dans le même créneau temporel et à la même fréquence.
EP08871897.8A 2008-01-30 2008-11-12 Mécanisme de rapport dans un système radio réutilisant un créneau temporel Not-in-force EP2235855B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
PCT/SE2008/050116 WO2009096832A1 (fr) 2008-01-30 2008-01-30 Partage de créneaux temporels par utilisation de modulation qpsk non équilibrée
US2794308P 2008-02-12 2008-02-12
PCT/SE2008/051296 WO2009096843A1 (fr) 2008-01-30 2008-11-12 Mécanisme de rapport dans un système radio réutilisant un créneau temporel

Publications (2)

Publication Number Publication Date
EP2235855A1 true EP2235855A1 (fr) 2010-10-06
EP2235855B1 EP2235855B1 (fr) 2015-01-07

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP08871897.8A Not-in-force EP2235855B1 (fr) 2008-01-30 2008-11-12 Mécanisme de rapport dans un système radio réutilisant un créneau temporel

Country Status (4)

Country Link
US (1) US9112598B2 (fr)
EP (1) EP2235855B1 (fr)
CN (1) CN101926108B (fr)
WO (1) WO2009096843A1 (fr)

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Also Published As

Publication number Publication date
US20100311410A1 (en) 2010-12-09
CN101926108A (zh) 2010-12-22
US9112598B2 (en) 2015-08-18
WO2009096843A1 (fr) 2009-08-06
CN101926108B (zh) 2014-05-14
EP2235855B1 (fr) 2015-01-07

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